Technological progress, organizational change and the size of the Human Resources Department



and the first-order conditions are given by:

∂ L
∂ct
∂L
∂Tts
∂ L

∂at+1
∂ L

∂ht
∂L
dμt
∂ L
∂λt


βt

- — β tμt = 0

ct

βtμtwtht - βλt (1 - δ) Ethδ (1 Tts)-δ = 0

βt+1μt+1 (1 + rt+i) βtμt = 0

β t+1μt+1Wt+1Tts+1 + β t+1λtδEthδ-1 (1 Γ      — β tλt = 0

βt [(1 + rt) at + wthtTts ct at+i] = 0

βt hEthtδ (1 Tts)1-δ ht+1i =0

from which, rearranging and substituting, we get the following relevant equations:

ɪ = β- (1+ r,+1)
ct    ct+1

(9)

(10)

(11)

(12)


Wtht       = eôw^—Ts+^ + βwt+1Tts+1

ct (1 δ) Ethtδ (1 Tts)-δ       ct+1 (1 δ)           ct+1

at+1 =(1+rt) at + Wt htTts ct

ht+1 = Ethtδ (1 Tts)1-δ

Equation (9) is the typical Euler equation for optimal consumption over time.
Equation (10) is the optimality condition for human capital accumulation after sub-
stitution of the Lagrange multipliers
λt and μt using the first-order conditions with
respect to consumption and production time supply notably. The left-hand side mea-
sures the marginal cost of human capital accumulation, which is simply reflected in
the wage forgone in period
t due to education. The right-hand side is the sum of
two marginal benefit terms: the increase in the marginal productivity of education
time in
t +1 and the increasing labour remuneration in the same period. Equations
(11) and (12) are just the law of evolution of consumer’s wealth and the education
technology respectively.

3.3 Market equilibrium conditions

Together with the solution of the problem of the firm and of the household, the
stationary equilibrium of the decentralized economy is characterized also by the
market equilibrium condition:

, nξ (1 Pt)θ ρη
yt = Ct +-------J-------

dt

15



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